Which of the following is NOT a desirable property of a coating?

A coating's ideal properties are crucial to its performance and longevity in various environments. Cohesive strength is important because it ensures the coating maintains its integrity and does not fail under stress. Impact resistance is desirable as it allows the coating to withstand physical impacts without cracking or chipping, which is essential in many applications where durability is key. Water resistance is also critical, especially in environments exposed to moisture, as it prevents corrosion and degradation of both the coating and the underlying substrate.

Flammability, on the other hand, is not a desirable property in coatings. A coating that is flammable can pose significant safety risks, particularly in industrial settings or areas where fire hazards are a concern. Ideally, coatings should be formulated to be non-flammable or have low flammability to ensure safety and compliance with industry regulations. Therefore, flammability stands out as a property that is unequivocally undesirable in the context of coating performance.